The grand Bliss web site (official) describes a kids club as an amenity.
OK, on the way back from the beach stopped by the Grand Mayan KZ.
Basically similar to Luxxe except not as upscale (as if the kids care) from 9-5:30 day care (5-12) for 150 pesos including lunch - open to all including Mayan Palace. Seems like a hellova deal to me.
They also have as does the Luxxe I believe, 2 or 3 nights day care for 200p from 7-10:30pm.
At the GM, there is also a large family part of the pool with very shallow water and kid thingees to play with - quite nice. i don't think the Luxxe had that - just a fun day care.
I did verify - nothing at GB.
Mike